Pozo Azul, Burgos: 6 km of passages, one of the longest in Europe. Canelles reservoir with the submerged village of Blancafort. Ruidera Lagoons: karstic clarity. Lower density means more ballast. Temperature 8-15°C.
Spain has freshwater diving options that are frequently overlooked. The Ruidera Lagoons offer crystal-clear karst-fed waters with surprising visibility and seabeds of great ecological value. Reservoirs and dams are also frequented for training and certification dives, though the fauna is more limited. This type of diving requires additional training and specific equipment.
Pozo Azul in Burgos, with flooded passages of more than six kilometers of known development, is considered one of the longest cave diving systems in Europe. Reservoirs with submerged villages, such as the Canelles reservoir with the remains of Blancafort or the Riaño reservoir, offer a unique historical experience with architectural structures between 10 and 40 meters deep. The main technical difference compared to sea diving is the lower density of fresh water, which requires adding extra weight, combined with generally colder temperatures (between 8 and 15 °C).